However, non-greenhouse gas emissions are not a significant problem, as the U.S. Environmental Protection Agency reports emissions of the Six Principal Pollutants have declined to less than a third of 1980 emissions levels.
Cellulosic ethanol uses non-food feed stocks with significant greenhouse gas emission reductions, and the first commercial-scale plant is being built today in Soperton, Ga.
At the annual meeting of the Carbon Disclosure Project--a non-profit investor organization devoted to greater transparency in greenhouse gas emission statistics--Sun released a set of open-source software tools that companies can use to track carbon emissions.